The ordinate or the more nearly vertical axis in a graph or Cartesian coordinate system. Sometimes this numeric value is used in conjunction with the X Axis to define the location of parcels in a GIS system.

The Y axis represents the voltage displayed on the face of the oscilloscope

in a two-dimensional plot, the vertical axis. In a three-dimensional plot, the Y axis is the axis perpendicular to the X-Z plane.

The vertical directional flow of an adhesive or the vertical directional flow of electricity through a conductive material or device.

Denoted the vertical axis of a picture; to move a picture in the Y axis is to move it up or down.

the axis that specifies height in the coordinate system. The second value in an x,y,z coordinate set represents a location in space relative to the Y axis.

the vertical scale on a bar chart that displays the range of values in a bar chart

One of the axes in a three dimensional system.

A two-dimensional coordinates system's vertical direction, perpendicular to the x axis. The y-y signifies one direction followed with a step AND repeat method.